Air-cushion for valves.



Patented Mar.`25, |902. J. CREGAR.

AIB CUSHION FDR VALVES.

(Apphcntion led Feb 4, 1901 (No Model.)

W'TNESSES:

of( WJ/d- Artnr OFFICE.

JOSHUA IV. OREGAR, OF PHILADELPHIA, PENNSYLVANIA.

AlR-CUSHION FOR VALVES.

SPECIFICATION forming part of Letters Patent No. 696,009, dated March 25, 1902.

Application tiled February 4, 1901. Serial No. 45,884. (No model.)

T0 @ZZ whom, it may concern:

Be it known that I, JOSHUA W. CREGAR, a citizen ofthe United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Air-Cushions for Valves, of which the following is a 'my particular arrangement of aircushion is,

first, to react in producing a free flow of water through the spout, and, second, to eifect the closure of the valve under a pressure of air induced by the pressure of water that, bearing upon the volume of water considerably below the spout-egress, will form a cushion for the water as the valve is returning to its seat, thereby causing the return to be of a movement to prevent the usual knock or hammer and consequent pounding and strain upon the pipe.

A further object is to produce these effects in a valve without the use of springs or other mechanical attachments extraneous to the valve proper.

A further object is to construct a valve and stem operative without the usual packing.

In my invention I have so simplified the construction as to produce a perfect self-closing noiseless valve with the employment of a single air-tube, upon which is secured the valve, with the ext-ended upper closed end and the downwardly-projecting portion contiguous to the iniiow, whereby the pressure of air is initial with the closing of the valve and continuous until the valve is opened.

The invention consists in the parts and combination of parts hereinafter described, and pointed out in the claim.

In the drawings, Figure 1 is a longitudinal vertical section of the device, showing the valve closed. Fig. 2 is a longitudinal vertical section of the air-pipe, showing the valve interposed intermediate its length.

I have illustrated my invention in connection with a basin-cock, in which 1 designates `The lower portion of the shell is tubular and hanged at 10, there being a packing-nut 11 seated thereon when screwed into the annular screw threadedportion 12 of a waterchamber 13, shouldered at 14 to receive a flexible valve-seat 15, of any suitable material, against which the valve 16 seats, the valve 16 being secured upon air-pipe S intermediate its length, with the reduced end 17 of the water-chamber screw-threaded to receive a nut, (not shown,) by which to secure the basin-cock to a base.

The operation will be apparent. Water being admitted into the end 17 of the waterchamber compresses the air into pipe 8 considerably below valve 16 and enters the same as far as water-pressure will compress the air, the flow to the water chamber and spout being in and through the annular space 18, around the air-tube 8, through the space formed by the annular neck of the waterchamber into the waterchamber, and nds egress through the spout, the air acting as a cushion when the valve-stem is released and producing an equilibrium between the pressure of the Water and themovement and force of the valve, whereby the usual pounding in the pipe is obviated and the valve is seated quickly without injury to its seat.

In a cushioned valve, a head and spout, a.

JOSHUA W. CREGAR.

Vitnesses:

H. B. SrAcnY, R. W. BARwooD.

IOO 

